You knew that, right? How else would Facebook know to serve that panda video straight into your newsfeed, and leave your college friend's ill-informed rant about Pacific trade deals in the dark bowels of its servers?

How else would it know to serve you with 7,000 ads for wedding dress vendors the very day you announce your engagement? How, my friend, could it deliver that invitation to "like" the Doritos Locos taco when you had only just yourself realized that you were craving terrible Mexican food?

Facebook knows what you like. It knows what you don't like. It probably knows whether you have been naughty or nice, and will be selling that data to Santa this Christmas season.